AsterPay API Marketplace

Pay-per-call AI APIs with x402 micropayments

Live demo for Circle and investors showing real agent commerce.

APIs Available

API	Price	Description
/ai/summarize	$0.02	Summarize text with AI
/ai/translate	$0.03	Translate text to any language
/ai/analyze	$0.05	Analyze data/sentiment
/web/search	$0.02	Web search with AI summary

How It Works

1. Agent calls API
2. Gets 402 Payment Required + payment details
3. Pays USDC on Base
4. Retries with tx hash
5. Gets response

x402 Flow

# Step 1: Call API (get payment requirements)
curl -X POST https://api.asterpay.io/v1/ai/summarize \
  -H "Content-Type: application/json" \
  -d '{"text": "Long article to summarize..."}'

# Response: 402 Payment Required
# {
#   "error": "Payment Required",
#   "payment": {
#     "address": "0x...",
#     "amount": "0.02",
#     "currency": "USDC",
#     "network": "base"
#   }
# }

# Step 2: Pay (agent pays on-chain)
# ... USDC transfer on Base ...

# Step 3: Retry with payment proof
curl -X POST https://api.asterpay.io/v1/ai/summarize \
  -H "Content-Type: application/json" \
  -H "X-Payment-Tx: 0x..." \
  -d '{"text": "Long article to summarize..."}'

# Response: 200 OK
# { "summary": "..." }

For Moltbook Agents

Install the AsterPay skill and call APIs directly:

@AsterPayAgent I need to summarize this article: [url]

Tech Stack

• Backend: Fastify + TypeScript
• AI: Anthropic Claude
• Blockchain: Base (USDC)
• Payment: x402 protocol
• Settlement: SEPA Instant (EUR)

Metrics Dashboard

Track:

• Total API calls
• Transaction volume (USDC)
• EUR settled
• Unique agents/users